Communication method and communications apparatus

Abstract

Example communication methods and communications apparatus are described. One example method includes determining power of a demodulation reference signal (DMRS) by a terminal device. The terminal device sends the DMRS based on the determined power. In embodiments of this application, the power of the DMRS can be flexibly determined for different communication statuses.

What is claimed is: 
     
       1. A demodulation reference signal (DMRS) transmitting method, comprising:
 determining a power boost value for a DMRS; and 
 transmitting the DMRS based on the determined power boost value, wherein the power boost value satisfies at least one of the following :
 the power boost value is 0 dB when an uplink scheduling command associated with the DMRS is downlink control information (DCI) of a first format, an uplink transmission waveform is cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM), and a quantity of symbols occupied in uplink transmission is less than or equal to 2; 
 the power boost value is 0 dB when a radio resource control (RRC) connection is not established, an uplink transmission waveform is CP-OFDM, and a quantity of symbols occupied in the uplink transmission is less than or equal to 2; or 
 the power boost value is 0 dB when an uplink scheduling command associated with the DMRS is DCI, cyclic redundancy check (CRC) of the DCI is scrambled by using a temporary configure radio network temporary identity (TC-RNTI), an uplink transmission waveform is CP-OFDM, and a quantity of symbols occupied in the uplink transmission is less than or equal to 2; 
 
 wherein the first format is not 0_1. 
 
     
     
       2. The DMRS transmitting method according to  claim 1 , wherein the first format is 0_0. 
     
     
       3. The method according to  claim 1 , wherein the power boost value is a boost value relative to a power of a physical uplink shared channel (PUSCH). 
     
     
       4. A demodulation reference signal (DMRS) transmitting method, comprising:
 determining a power boost value for a DMRS; and 
 transmitting the DMRS based on the determined power boost value, wherein the power boost value satisfies at least one of the following powers:
 the power boost value is regular is X dB when an uplink scheduling command associated with the DMRS is downlink control information (DCI) of a first format, an uplink transmission waveform is cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM), and a quantity of symbols occupied in the uplink transmission is greater than 2; 
 the power boost value X dB when a radio resource control (RRC) connection is not established, an uplink transmission waveform is CP-OFDM, and a quantity of symbols occupied in the uplink transmission is greater than 2; or 
 the power boost value is X dB when the uplink scheduling command associated with the DMRS is DCI, cyclic redundancy check (CRC) of the DCI is scrambled by using a temporary configure radio network temporary identity (TC-RNTI), an uplink transmission waveform is CP-OFDM, and a quantity of symbols occupied in the uplink transmission is greater than 2; 
 
 wherein the first format is not 0_1, and X is greater than 0. 
 
     
     
       5. The DMRS transmitting method according to  claim 4 , wherein the first format is 0_0. 
     
     
       6. The DMRS transmitting method according to  claim 4 , wherein X=3. 
     
     
       7. The method according to  claim 4 , wherein the power boost value is a boost value relative to a power of a physical uplink shared channel (PUSCH). 
     
     
       8. A demodulation reference signal (DMRS) transmitting method, comprising:
 determining a power boost value for a DMRS; and 
 transmitting the DMRS based on the determined power boost value, wherein the power boost value satisfies at least one of the following:
 the power boost value is X dB when an uplink scheduling command associated with the DMRS is downlink control information (DCI) of a first format and an uplink transmission waveform is discrete Fourier transform-spread spectrum orthogonal frequency division multiplexing multiple access (DFT-s-OFDM); 
 the power boost value is X dB when a radio resource control (RRC) connection is not established and an uplink transmission waveform is DFT-s-OFDM; or 
 the power boost value is X dB when an uplink scheduling command associated with the DMRS is DCI, cyclic redundancy check (CRC) of the DCI is scrambled by using a temporary configure radio network temporary identity (TC-RNTI), and the uplink transmission waveform is DFT-s-OFDM; 
 wherein the first format is not 0_1, and X is greater than 0. 
 
 
     
     
       9. The DMRS transmitting method according to  claim 8 , wherein the first format is 0_0. 
     
     
       10. The DMRS transmitting method according to  claim 8 , wherein X=3. 
     
     
       11. The method according to  claim 8 , wherein the power boost value is a boost value relative to a power of a physical uplink shared channel (PUSCH). 
     
     
       12. An apparatus, comprising:
 at least one processor, and 
 one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to perform operations comprising:
 determining a power boost value for ef a demodulation reference signal (DMRS); and 
 transmitting the DMRS based on the determined power boost value, wherein the power boost value satisfies at least one of the following powers:
 the power boost value is 0 dB when an uplink scheduling command associated with the DMRS is downlink control information (DCI) whose format is of a first format, an uplink transmission waveform is cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM), and a quantity of symbols occupied in uplink transmission is less than or equal to 2; 
 the power boost value is 0 dB when a radio resource control (RRC) connection is not established, an uplink transmission waveform is CP-OFDM, and a quantity of symbols occupied in the uplink transmission is less than or equal to 2; or 
 the power boost value is 0 dB when an uplink scheduling command associated with the DMRS is DCI, cyclic redundancy check (CRC) of the DCI is scrambled by using a temporary configure radio network temporary identity (TC-RNTI), an uplink transmission waveform is CP-OFDM, and a quantity of symbols occupied in the uplink transmission is less than or equal to 2; 
 wherein the first format is not 0_1. 
 
 
 
     
     
       13. The apparatus according to  claim 12 , wherein the first format is 0_0. 
     
     
       14. The apparatus according to  claim 12 , wherein the power boost value is a boost value relative to a power of a physical uplink shared channel (PUSCH). 
     
     
       15. An apparatus, comprising:
 at least one processor, and 
 one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to perform operations comprising:
 determining a power boost value for ef a demodulation reference signal (DMRS); and 
 transmitting the DMRS based on the determined power boost value, wherein the power boost value satisfies at least one of the following:
 the power boost value is X dB when an uplink scheduling command associated with the DMRS is downlink control information (DCI) of a first format, an uplink transmission waveform is cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM), and a quantity of symbols occupied in the uplink transmission is greater than 2; 
 the power boost value is X dB when a radio resource control (RRC) connection is not established, an uplink transmission waveform is CP-OFDM, and a quantity of symbols occupied in the uplink transmission is greater than 2; or 
 the power boost value is X dB when the uplink scheduling command associated with the DMRS is DCI, cyclic redundancy check (CRC) of the DCI is scrambled by using a temporary configure radio network temporary identity (TC-RNTI), an uplink transmission waveform is CP-OFDM, and a quantity of symbols occupied in the uplink transmission is greater than 2; 
 wherein the first format is not 0_1, and X is greater than 0. 
 
 
 
     
     
       16. The apparatus according to  claim 15 , wherein the first format is 0_0. 
     
     
       17. The apparatus according to  claim 15 , wherein X=3. 
     
     
       18. The apparatus according to  claim 15 , wherein the power boost value is a boost value relative to a power of a physical uplink shared channel (PUSCH). 
     
     
       19. An apparatus, comprising:
 at least one processor, and 
 one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to perform operations comprising:
 determining a power boost value for a demodulation reference signal (DMRS); and 
 transmitting the DMRS based on the determined power boost value, wherein the power boost value satisfies at least one of the following:
 the power boost value is X dB when an uplink scheduling command associated with the DMRS is downlink control information (DCI) of a first format and an uplink transmission waveform is discrete Fourier transform-spread spectrum orthogonal frequency division multiplexing multiple access (DFT-s-OFDM); 
 the power boost value is X dB when a radio resource control (RRC) connection is not established and an uplink transmission waveform is DFT-s-OFDM; or 
 the power boost value is X dB when an uplink scheduling command associated with the DMRS is DCI, cyclic redundancy check (CRC) of the DCI is scrambled by using a temporary configure radio network temporary identity (TC-RNTI), and the uplink transmission waveform is DFT-s-OFDM; 
 wherein the first format is not 0_1, and X is greater than 0. 
 
 
 
     
     
       20. The apparatus according to  claim 19 , wherein the first format is 0_0. 
     
     
       21. The apparatus according to  claim 19 , wherein X=3. 
     
     
       22. The apparatus according to  claim 19 , wherein the power boost value is a boost value relative to a power of a physical uplink shared channel (PUSCH). 
     
     
       23. A non-transitory computer-readable storage medium comprising programming instructions for execution by at least one processor to perform at least the following operations:
 determining a power boost value for a demodulation reference signal (DMRS); and 
 transmitting the DMRS based on the determined power boost value, wherein the power boost value satisfies at least one of the following:
 the power boost value is 0 dB when an uplink scheduling command associated with the DMRS is downlink control information (DCI) of a first format, an uplink transmission waveform is cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM), and a quantity of symbols occupied in uplink transmission is less than or equal to 2; 
 the power boost value is 0 dB when a radio resource control (RRC) connection is not established, an uplink transmission waveform is the cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM), and a quantity of symbols occupied in the uplink transmission is less than or equal to 2; or 
 the power boost value is 0 dB when an uplink scheduling command associated with the DMRS is DCI, cyclic redundancy check (CRC) of the DCI is scrambled by using a temporary configure radio network temporary identity (TC-RNTI), an uplink transmission waveform is CP-OFDM, and a quantity of symbols occupied in the uplink transmission is less than or equal to 2; 
 wherein the first format is not 0_1. 
 
 
     
     
       24. The non-transitory computer-readable storage medium according to  claim 23 , wherein the first format is 0_0. 
     
     
       25. The non-transitory computer-readable storage medium according to  claim 23 , wherein the power boost value is a boost value relative to a power of a physical uplink shared channel (PUSCH). 
     
     
       26. A non-transitory computer-readable storage medium comprising programming instructions for execution by at least one processor to perform at least the following operations:
 determining a power boost value for a demodulation reference signal (DMRS); and 
 transmitting the DMRS based on the determined power boost value, wherein the power boost value satisfies at least one of the following:
 the power boost value is X dB when an uplink scheduling command associated with the DMRS is downlink control information (DCI) of a first format, an uplink transmission waveform is cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM), and a quantity of symbols occupied in the uplink transmission is greater than 2; 
 the power boost value is X dB when a radio resource control (RRC) connection is not established, an uplink transmission waveform is CP-OFDM, and a quantity of symbols occupied in the uplink transmission is greater than 2; 
 the power boost value is X dB when the uplink scheduling command associated with the DMRS is DCI, cyclic redundancy check (CRC) of the DCI is scrambled by using a temporary configure radio network temporary identity (TC-RNTI), an uplink transmission waveform is CP-OFDM, and a quantity of symbols occupied in the uplink transmission is greater than 2; 
 the power boost value is X dB when an uplink scheduling command associated with the DMRS is DCI whose format is a first format and an uplink transmission waveform is discrete Fourier transform-spread spectrum orthogonal frequency division multiplexing multiple access (DFT-s-OFDM); 
 the power boost value is X dB when a RRC connection is not established and an uplink transmission waveform is DFT-s-OFDM; or 
 the power boost value is X dB when an uplink scheduling command associated with the DMRS is DCI, CRC of the DCI is scrambled by using TC-RNTI, and the uplink transmission waveform is DFT-s-OFDM; 
 wherein the first format is not 0_1, and X is greater than 0. 
 
 
     
     
       27. The non-transitory computer-readable storage medium according to  claim 26 , wherein the first format is 0_0. 
     
     
       28. The non-transitory computer-readable storage medium according to  claim 26 , wherein X=3. 
     
     
       29. The non-transitory computer-readable storage medium according to  claim 26 , wherein the power boost value is a boost value relative to a power of a physical uplink shared channel (PUSCH).